CN113394302B - Solar cell based on different black phosphorus materials and preparation method - Google Patents
Solar cell based on different black phosphorus materials and preparation method Download PDFInfo
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 12
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
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- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 8
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- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
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- H01L31/022466—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers
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Abstract
A new type of heterojunction solar cell is realized by different stacking structures of different types of black phosphorus. The heterojunction thin-film solar cell sequentially comprises five layers of structures from bottom to top: a substrate, an ITO coating, a double-layer AB stack GeS, a double-layer rotating AD stack SnS and an upper electrode. The double-layer AB stacking GeS and the double-layer rotating SnS-ADd stacking are combined to form a II type semiconductor heterojunction, the double-layer rotating SnS with an AD structure is used as a donor, the energy band gap is 1.4654eV, and the GeS with an AB structure is used as an acceptor. The double-layer black phosphorus-like structure with different stacking structures is obtained by a mechanical stripping method. Under the irradiation of white light, the open-circuit voltage of the solar cell provided by the invention theoretically reaches 1.088V, the short-circuit current density reaches 301.937A/square meter, and the AM1.5 energy conversion efficiency of the solar cell reaches 21.35%.
Description
Technical Field
The invention relates to a method for realizing a semiconductor solar cell by using a few-layer GeS stack and a few-layer SnS stack structure, belonging to the technical field of semiconductors.
Background
Energy is the cornerstone of human survival and the engine for the development of the human global economy. The unrestricted use of non-renewable traditional energy sources creates many ecological problems such as greenhouse effect, atmospheric pollution and the like, and influences the survival of human beings. Therefore, the development of renewable clean energy is imminent, and solar energy is a new green and environment-friendly energy source, which attracts the attention of new energy developers.
Solar energy has the characteristics of inexhaustibility, cleanness, no pollution and the like, and is undoubtedly a very high-quality option when people urgently need energy substitution to relieve energy shortage. The replacement of renewable energy sources for non-renewable energy sources has become an urgent problem to be solved worldwide. The effective utilization and development of solar energy is helpful to solve the existing energy problems. Through continuous breakthrough and innovation of scientific research experiments, renewable clean energy is orderly developed and utilized on a large scale to solve the severe problem caused by the utilization of non-renewable energy, and the harmonious development of human and nature is achieved, which has great strategic significance.
In recent years, 2D materials with atomic layer thickness have been extensively studied due to their superior properties, such as graphene, MoS2, black phosphorus, and the like. Recently, new black phosphorus-like materials have received attention. The black phosphorus-like material and the black phosphorus material have properties similar to each other, such as high electron mobility and excellent optical properties. And the black-like phosphenes are more stable than black phosphenes. The method selects 2 stable black phosphorus alkene-like structures, namely a double-layer GeS-AB stack and a double-layer rotation SnS-AD stack through theoretical calculation. Semiconductor solar cells are fabricated herein by constructing a type ii semiconductor heterojunction with these 2 structures. Under the irradiation of white light, the open-circuit voltage of the solar cell provided by the invention theoretically reaches 1.088V, the short-circuit current density reaches 301.937A/square meter, and the AM1.5 energy conversion efficiency of the solar cell reaches 21.35%.
Disclosure of Invention
1. The technical problem is as follows: the invention aims to provide a heterojunction solar cell and a preparation method thereof.
2. The technical scheme is as follows: a heterojunction thin-film solar cell based on a black phosphorus-like material comprises the following structures from bottom to top: the bottom layer is a substrate, the second layer is an anode coating, and the third layer is a GeS structure with double AB stacks; the fourth layer is a double-layer rotating AD stack SnS, the uppermost layer is a cathode, the cathode accounts for 10 to 15 percent of the total area of the double-layer rotating SnS-AD stack, and the anode is arranged on the anode coating layer, so that the anode is not in contact with the GeS structure of the double-layer AB stack.
The heterojunction materials are a GeS structure with a double-layer AB stack and a SnS structure with a double-layer rotary AD stack respectively, and the two structures are obtained by staggering an initial structure by a probe stripping method.
The GeS of the double-layer AB stack and the SnS of the double-layer rotary AD stack in the heterojunction solar cell are double-layer and have the thickness ofThe double-layer GeS-AB stacking structure is as follows: the first layer structure corresponds to a shift of about 0.281 cycles in the a direction relative to the second layer, while the second layer of the two-layer rotating SnS-AD stack corresponds to a shift of the first layer by half a cycle in the b direction and a rotation of the second layer by 180 ° relative to the first layer; the GeS double-layer film of the AB stack and the rotary SnS double-layer film of the AD stack form a heterojunction, the AD stack is used as a donor part, the AB stack is used as an acceptor part, and the double-layer rotary SnS-AD stack and the double-layer AB stack GeS form a type II heterojunction.
The anode and the substrate are all integrated conductive glass.
A preparation method of the heterojunction thin-film solar cell based on the black phosphorus-like material comprises the following steps:
a. preparing a substrate and an anode electrode by adopting a photoetching method, so that the anode is not contacted with the GeS structure of the double-layer AB stack;
preparing a GeS film and an SnS film: preparing GeS by using a liquid phase method, and preparing SnS by using an electrodeposition method;
and c, SnS stacking and GeS stacking preparation:
1) peeling the obtained SnS film to obtain a double-layer SnS film by a probe peeling method under an electron microscope;
2) carrying out the relative distance between the moving layers of the probe or carrying out the rotation transformation between the layers of the SnS obtained in the step 1) under an electron microscope to obtain a required double-layer rotation SnS-AD stack, and finally combining the two layers to form a transverse heterojunction through the Van der Waals force between the layers;
3) preparing a GeS-AB stack by the same method of the steps 1) and 2);
d. device combination
Transferring the double-layer GeS-AB stack obtained in the step c to the position above an ITO coating through a two-dimensional material transfer device, stacking the double-layer rotary SnS-AD stack obtained in the step c above the GeS-AB stack through a two-dimensional material transfer system, finally annealing the obtained device,
e. and e, evaporating a metal layer on the top of the device obtained by the step d by using a metal evaporation technology to be used as a cathode, wherein the metal layer accounts for 10-15% of the total area of the double-layer rotary SnS-AD stack.
The preparation method of the heterojunction thin-film solar cell based on the black phosphorus-like material comprises the following specific steps of preparing a substrate and an anode electrode by adopting a photoetching method in the step a:
the method comprises the steps of adopting conductive glass as a substrate and an electrode, firstly coating uniform photoresist on the conductive glass, obtaining an inverse pattern corresponding to an electrode pattern through a photoetching technology, obtaining a pattern of a lower metal electrode through exposure treatment, and then carrying out metal evaporation. And (3) cleaning the redundant photoresist by using acetone mixed liquid to ensure that the anode is not contacted with the GeS structure of the double-layer AB stack, thus obtaining the conductive glass structure with the metal electrode.
The method for preparing GeS by using the liquid phase method comprises the steps of respectively stirring germanium-dioxane complex chloride, thiourea and oleamide 0LA in a certain ratio in air by a slight magnetic force; ultrasonically treating the stirred liquid mixture to remove air in the oleylamine; subsequently, the flask was connected to a Schlenk line, and vacuum was applied to remove moisture and oxygen; introducing nitrogen for inert gas protection under magnetic stirring; heating the treated liquid mixture, gradually changing the liquid into a yellow transparent solution along with the increase of the temperature, and refluxing the reaction mixture in nitrogen flow for reaction; after the reaction is finished, the solution is cooled to room temperature, the precipitate is centrifugally separated, washed and dried in vacuum to obtain a sample.
Preparing SnS by electrodeposition method, preparing deposition liquid, introducing nitrogen into deionized water, adding medicine into water, and weighing quantitative SnCl 2 -2H 2 O、Na 2 S 2 O 3 -5H 2 O、K 4 P 2 O 7 And additive C 19 H 42 BrN or CO (NH) 2 ) 2 Proper amount of CuCl 2 -2H 2 O or AlCl 3 -6H 2 Dissolving O in deionized water, adjusting the pH value of the deposition solution to 2.8-3.0 by using dilute sulfuric acid, uniformly stirring for later use, inserting three electrodes into the deposition solution, depositing in a constant-temperature water bath kettle at a constant stirring speed, performing constant potential deposition, placing the obtained deposited film in a porcelain boat, placing the porcelain boat in a tubular furnace, annealing in an inert atmosphere, and cooling to room temperature along with the furnace.
Has the beneficial effects that: compared with the prior art, the invention has the following beneficial effects:
1. the method comprises the steps that two-dimensional materials are selected, the heterojunction materials are a double-layer AB stacked GeS structure and a double-layer rotary AD stacked SnS structure, and the two structures are obtained through a probe stripping method; the two materials are both in a double-layer structure, the thickness of the materials can reach the atomic level, and the materials are very thin and have good light transmission and electrical conductivity, so that the semiconductor solar cell can be made to be extremely thin.
2. The material selected by the invention belongs to a black phosphorus-like material, and the lattice adaptation can be easily achieved.
3. The heterojunction employed in the present invention is a type ii heterojunction structure, which is generally defined as the band structure of the heterojunction expressed as: the signs of delta Ec (the energy difference between the bottom of the narrow band and the bottom of the wide band guide band) and delta Ev (the energy difference between the top of the narrow band and the top of the wide band valence band) are the same; the structure is thus defined as a double layer rotated SnS-AD stack with CBM (bottom conduction band) on top of the double layer GeS-AB stack CBM and double layer rotated SnS-AD stack with VBM (top valence band) on top of the double layer GeS-AB stack VBM. The built-in electric field formed by the alignment of the type II energy band can effectively separate photo-generated electron-hole pairs, which is beneficial to the collection of photoelectrons. The selected materials are stacked to form the II-type semiconductor heterojunction solar cell, the open-circuit voltage of the solar cell can theoretically reach 1.088V, the short-circuit current density can reach 301.937A/square meter, and the AM1.5 energy conversion efficiency is as high as 21.35%.
4. The anode and the substrate adopted by the invention are all integrated conductive glass, and good ohmic contact can be formed, so that the performance of the device is obviously improved.
Description of the drawings:
fig. 1 is a schematic structural diagram of a heterojunction solar cell provided by the present invention. The bottom layer is a substrate 1, the second layer is an anode coating 2, and the third layer is a GeS structure 4 with double AB stacks; 5 is a fourth layer of double-layer rotary AD stack SnS, 6 is a cathode, and 3 is an anode
FIG. 2 is a graph of the band distribution of a dual layer GeSe-AD stack and a dual layer rotated GeS-AB stack.
Detailed Description
The invention provides a heterojunction thin-film solar cell, which comprises the following structures from bottom to top: the bottom layer is a substrate 1, the second layer is an ITO coating layer 2, and the third layer is a GeS structure 4 with double layers of AB stacks; the fourth layer is a double layer rotating AD stack SnS, with the top electrode 6 and the anode 3 on the ITO coating.
According to the heterojunction thin-film solar cell, heterojunction materials are a double-layer AB stacked GeS and a double-layer rotary AD stacked SnS respectively, and the two structures are obtained through a probe stripping method; the two materials are both of a double-layer structure, are very thin, and have good light transmission and electric conductivity.
The heterojunction semiconductor solar cell is obtained by dislocation of the initial structure of the double-layer rotating AD type SnS stack and the double-layer AB type GeS stack by a probe stripping method.
According to the heterojunction thin-film solar cell, the thickness of the GeS of the double-layer AB stack and the thickness of the SnS of the double-layer rotary AD stack in the heterojunction solar cell need to be double-layer, and the thickness isThe double-layer GeS-AB stacking structure is as follows: the first layer structure corresponds to a shift of about 0.281 cycles in the a direction relative to the second layer, while the second layer of the two-layer rotating SnS-AD stack corresponds to a shift of the first layer by half a cycle in the b direction, and the second layer is rotated 180 DEG relative to the first layer(ii) a The GeS double-layer film of the AB stack and the rotating SnS double-layer film of the AD stack form a heterojunction, the AD stack serves as a donor part, the AB stack serves as an acceptor part, and the double-layer rotating SnS-AD stack and the double-layer AB stack GeS form a type II heterojunction.
The heterojunction solar cell adopts a heterojunction with a type II heterojunction structure, wherein the type II heterojunction structure is generally defined as the energy band structure of the heterojunction and is represented as follows: the signs of delta Ec (the energy difference between the bottom of the narrow band and the bottom of the wide band guide band) and delta Ev (the energy difference between the top of the narrow band and the top of the wide band valence band) are the same; the structure is thus defined as a double layer rotated SnS-AD stack with CBM (bottom conduction band) on top of the double layer GeS-AB stack CBM and double layer rotated SnS-AD stack with VBM (top valence band) on top of the double layer GeS-AB stack VBM. The built-in electric field formed by the alignment of the type II energy band can effectively separate photo-generated electron-hole pairs, which is beneficial to the collection of photoelectrons.
The anode and the substrate adopted in the heterojunction solar cell can be integrated indium tin oxide glass (ITO), aluminum zinc oxide glass (AZO) or indium zinc oxide glass (IZO); the method can form good ohmic contact, thereby obviously improving the performance of the device. Alternatively, the cathode material is a matter of routine choice in the industry, such as metallic aluminum may be used.
The preparation method of the heterojunction semiconductor solar cell comprises the following steps:
a. preparation of substrates and electrodes
The invention adopts ITO conductive glass as a substrate and an electrode, firstly, the ITO glass is coated with uniform photoresist, an inverse pattern corresponding to an electrode pattern is obtained through a photoetching technology, a pattern of a lower metal electrode is obtained through exposure treatment, and then metal evaporation is carried out. And (4) cleaning the redundant photoresist by using acetone mixed liquid, thus obtaining the ITO glass structure with the metal electrode.
Preparation of GeS film and SnS film
The GeS nanosheet is prepared by a liquid phase method, 0.2g of germanium-dioxane complex chloride, 0.4g of thiourea and 20ml of oleamide 0LA are respectively added into a 25ml three-necked bottle, and the mixture is slightly stirred magnetically in the air; ultrasonically treating the stirred liquid mixture for 5min, and removing air in oleylamine; the three-necked flask was then connected to a Schlenk line and evacuated for 30min to remove moisture and oxygen; introducing nitrogen for 30min under magnetic stirring for inert gas protection; the treated liquid mixture was heated to 593k and the liquid gradually changed to a yellow clear solution as the temperature increased. The reaction mixture was refluxed at 593k in a nitrogen stream for 4 h; and after the reaction is finished, cooling the solution to room temperature, performing precipitation centrifugal separation, washing the solution for multiple times by using deionized water and absolute ethyl alcohol, and performing vacuum drying at 40 ℃ for 4 hours to obtain a sample.
The method comprises the steps of preparing SnS nanosheets by an electrodeposition method, firstly preparing a deposition solution, firstly introducing nitrogen into deionized water for 30min, then adding a medicine into the water, weighing quantitative SnCl2-2H2O, Na2S2O3-5H2O, K4P2O7 and an additive C19H42BrN or CO (NH2)2, dissolving a proper amount of CuCl2-2H2O or AlCl3-6H2O into 200ml of deionized water, adjusting the pH value of the electrodeposition solution by using dilute sulfuric acid to be 2.8-3.0, and uniformly stirring for later use. Inserting the three electrodes into the obtained solution, and performing product at a constant temperature of 40-60 ℃ in a constant-temperature water bath kettle, wherein the stirring speed is constant at 300rpm/min, and the product time is 30-50 min in a constant-potential product experiment. The deposited film obtained in the foregoing was placed in a porcelain boat, and the porcelain boat was then placed in a tube furnace. Setting an annealing program, wherein the temperature rise time is 5 ℃/min, the heat preservation temperature is 350 ℃, the heat preservation time is 30min, and the ventilation speed of protective gas argon is adjusted to be 200 ml/min-300 ml/min. And then cooling to room temperature along with the furnace.
SnS Stack and GeS Stack preparation
1) Peeling the obtained SnS film to obtain a double-layer SnS film by a probe peeling method under an electron microscope;
2) and (3) under an electron microscope, using a probe to move the relative distance between layers or carrying out rotation transformation between layers to obtain the double-layer rotation SnS-AD stacking required by us. Finally, combining the two through the Van der Waals force between layers to form a transverse heterojunction;
3) the GeS-AB stack can be prepared by the same method;
d. device combination
And c, transferring the double-layer GeS-AB stack obtained by the step c to the position above an ITO coating through a two-dimensional material transfer device, then stacking the double-layer rotary SnS-AD stack obtained by the step c above the GeS-AB stack through a two-dimensional material transfer system, and finally annealing the obtained device.
e. And e, evaporating a layer of metal on the top of the device obtained in the step d by using a metal evaporation technology.
In fig. 1, a heterojunction composed of a double-layer AB-type GeS stack (3) and a double-layer rotating AD-type SnS stack (4) is a core part of a semiconductor solar cell, and converts light energy into electric energy in the case of light irradiation. The reason for this is that: when the double-layer AB type GeS (3) is in contact with the double-layer rotating AD type SnS (4), due to the fact that the energy band structures of the double-layer AB type GeS and the double-layer rotating AD type SnS are different, the arrangement of the conduction band bottom CBM and the valence band top VBM of the double-layer AB type GeS and the double-layer rotating AD type SnS forms a II type semiconductor heterojunction, a depletion layer is formed on a contact interface, and under the condition of light irradiation, due to a photovoltaic effect, a potential difference can be generated at two ends of the heterojunction.
Examples
a. Preparation of substrates and electrodes
The invention adopts ITO conductive glass as a substrate and an electrode, firstly, the ITO glass is coated with uniform photoresist, an inverse pattern corresponding to an electrode pattern is obtained through a photoetching technology, a pattern of a lower metal electrode is obtained through exposure treatment, and then metal evaporation is carried out. And (4) cleaning the redundant photoresist by using acetone mixed liquid, thus obtaining the ITO glass structure with the metal electrode.
Preparation of GeS thin film and SnS thin film
The GeS nanosheet is prepared by a liquid phase method, 0.2g of germanium-dioxane complex chloride, 0.4g of thiourea and 20ml of oleamide 0LA are respectively added into a 25ml three-necked bottle, and the mixture is slightly stirred magnetically in the air; ultrasonically treating the stirred liquid mixture for 5min, and removing air in the oleylamine; the three-necked flask was then attached to a Schlenk line and evacuated for 30min to remove moisture and oxygen; introducing nitrogen for 30min under magnetic stirring for inert gas protection; the treated liquid mixture was heated to 593k and the liquid gradually changed to a yellow clear solution as the temperature increased. The reaction mixture was refluxed at 593k in a nitrogen stream for 4 h; and after the reaction is finished, cooling the solution to room temperature, performing precipitation centrifugal separation, washing the solution for multiple times by using deionized water and absolute ethyl alcohol, and performing vacuum drying at 40 ℃ for 4 hours to obtain a sample.
The SnS nanosheet is prepared by an electrodeposition method, firstly, a deposition solution is prepared, deionized water is firstly introduced with nitrogen for 30min, then, a medicine is added into the water, quantitative SnCl2-2H2O, Na2S2O3-5H2O, K4P2O7 and an additive C19H42BrN or CO (NH2)2 are weighed, a proper amount of CuCl2-2H2O or AlCl3-6H2O is dissolved into 200ml of deionized water, the pH value of the electrodeposition solution is adjusted by using dilute sulfuric acid to be 2.8-3.0, and the solution is uniformly stirred for later use. Inserting the three electrodes into the obtained solution, and performing product at a constant temperature of 40-60 ℃ in a constant-temperature water bath kettle, wherein the stirring speed is constant at 300rpm/min, and the product time is 30-50 min in a constant-potential product experiment. The deposited film obtained in the foregoing was placed in a porcelain boat, and the porcelain boat was then placed in a tube furnace. Setting an annealing program, wherein the temperature rise time is 5 ℃/min, the heat preservation temperature is 350 ℃, the heat preservation time is 30min, and the ventilation speed of protective gas argon is adjusted to be 200 ml/min-300 ml/min. And then cooling to room temperature along with the furnace.
SnS Stack and GeS Stack preparation
1) Peeling the obtained SnS film by a probe peeling method under an electron microscope to obtain a double-layer SnS film;
2) and (3) under an electron microscope, using a probe to move the relative distance between layers or carrying out rotation transformation between layers to obtain the double-layer rotation SnS-AD stacking required by us. Finally, combining the two through the Van der Waals force between layers to form a transverse heterojunction;
3) the GeS-AB stack can be prepared by the same method;
d. device combination
And c, transferring the double-layer GeS-AB stack obtained by the step c to the position above an ITO coating through a two-dimensional material transfer device, then stacking the double-layer rotary SnS-AD stack obtained by the step c above the GeS-AB stack through a two-dimensional material transfer system, and finally annealing the obtained device.
e. And d, evaporating the device obtained by the step d on the top of the device by a metal evaporation technology, wherein the metal can be aluminum.
Claims (7)
1. The solar cell based on the different black phosphorus materials is characterized by comprising the following structures from bottom to top: the bottom layer is a substrate (1), the second layer is an anode coating (2), and the third layer is a GeS structure (4) with a double-layer AB stack; the fourth layer is a double-layer rotating AD stack SnS (5), the uppermost layer is a cathode (6), the cathode accounts for 10 to 15 percent of the total area of the double-layer rotating SnS-AD stack, and the anode (3) is arranged on the anode coating, so that the anode (3) is not in contact with the GeS structure (4) of the double-layer AB stack; the GeS of the double-layer AB stack and the SnS of the double-layer rotary AD stack in the solar cell are double layers, the thickness of the double-layer GeS-AB stack is 7-14A, and the structure of the double-layer GeS-AB stack is as follows: the first layer structure is equivalent to a movement of 0.281 cycles in direction a relative to the second layer, while the second layer of the two-layer rotating SnS-AD stack is equivalent to a movement of the first layer by a distance of half a cycle in direction b and its second layer is rotated 180 ° relative to the first layer; the GeS double-layer film of the AB stack and the rotating SnS double-layer film of the AD stack form a heterojunction, the AD stack serves as a donor part, the AB stack serves as an acceptor part, and the double-layer rotating SnS-AD stack and the double-layer AB stack GeS form a type II heterojunction.
2. The solar cell based on the different types of black phosphorus materials as claimed in claim 1, wherein the GeS structure of the double-layer AB stack and the SnS structure of the double-layer rotary AD stack are obtained by offsetting the initial structure by a probe stripping method.
3. Solar cell based on different types of black phosphorus materials according to claim 1, characterized by the fact that the anode (3) and the substrate (1) are all integrated conductive glass.
4. A method for preparing a solar cell based on different types of black phosphorus materials according to claim 1, wherein the method comprises the following steps:
a. preparing a substrate and an anode electrode by adopting a photoetching method, so that the anode (3) is not contacted with the GeS structure (4) of the double-layer AB stack;
preparing a GeS film and a SnS film: preparing GeS by using a liquid phase method, and preparing SnS by using an electrodeposition method;
and c, SnS stacking and GeS stacking preparation:
1) peeling the obtained SnS film by a probe peeling method under an electron microscope to obtain a double-layer SnS film;
2) carrying out the relative distance between the moving layers of the probe or carrying out the rotation transformation between the layers of the SnS obtained in the step 1) under an electron microscope to obtain a required double-layer rotation SnS-AD stack, and finally combining the two layers to form a transverse heterojunction through the Van der Waals force between the layers;
3) preparing a GeS-AB stack by the same method of the steps 1) and 2);
d. device combination
C, transferring the double-layer GeS-AB stack obtained by the step c to the position above an ITO coating through a two-dimensional material transfer device, then stacking the double-layer rotary SnS-AD stack obtained by the step c above the GeS-AB stack through a two-dimensional material transfer system, finally annealing the obtained device,
e. and e, evaporating a metal layer on the top of the device obtained by the step d by using a metal evaporation technology to be used as a cathode, wherein the metal layer accounts for 10-15% of the total area of the double-layer rotary SnS-AD stack.
5. The method for preparing the heterojunction thin-film solar cell based on the black phosphorus-like material as claimed in claim 4, wherein the specific method for preparing the substrate and the anode electrode by adopting the photolithography method in the step a comprises the following steps:
the conductive glass is adopted as a substrate and an electrode, uniform photoresist is coated on the conductive glass firstly, an inverse pattern corresponding to an electrode pattern is obtained through a photoetching technology, a pattern of a lower metal electrode is obtained through exposure treatment, then metal evaporation is carried out, and redundant photoresist is cleaned by using acetone mixed liquid, so that an anode (3) is not in contact with a GeS structure (4) stacked by double layers of AB, and the conductive glass structure with the metal electrode is obtained.
6. The method for preparing solar cells based on heterogeneous black phosphorus materials according to claim 4, wherein the GeS is prepared by a liquid phase method by slightly magnetically stirring germanium-dioxane complex, thiourea and oleamide 0LA in a stoichiometric ratio in air; ultrasonically treating the stirred liquid mixture to remove air in the oleylamine; subsequently, the flask was connected to a Schlenk line, and vacuum was applied to remove moisture and oxygen; introducing nitrogen for inert gas protection under magnetic stirring; heating the treated liquid mixture, gradually changing the liquid into a yellow transparent solution along with the increase of the temperature, and refluxing the reaction mixture in nitrogen flow for reaction; after the reaction is finished, the solution is cooled to room temperature, the precipitate is centrifugally separated, washed and dried in vacuum to obtain a sample.
7. The method for preparing solar cells based on different types of black phosphorus materials as claimed in claim 4, wherein the deposition solution is prepared by an electrodeposition method, the deionized water is firstly introduced with nitrogen, then the chemical is added into the water, and the quantitative SnCl is weighed 2 -2H 2 O、Na 2 S 2 O 3 -5H 2 O、K 4 P 2 O 7 And additive C 19 H 42 BrN or CO (NH) 2 ) 2 Proper amount of CuCl 2 -2H 2 O or AlCl 3 -6H 2 Dissolving O in deionized water, adjusting the pH value of the deposition solution to 2.8-3.0 by using dilute sulfuric acid, uniformly stirring for later use, inserting three electrodes into the deposition solution, depositing in a constant-temperature water bath kettle at a constant stirring speed, performing constant potential deposition, placing the obtained deposited film in a porcelain boat, placing the porcelain boat in a tubular furnace, annealing in an inert atmosphere, and cooling to room temperature along with the furnace.
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